tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   9477ec75947f2cf0fc47e8ab781a5e9171099be2
commit: e55df12f7e8d661266c52b2dbed35d88a9f4f8a7 [155/319] printk: allow increasing the ring buffer depending on the number of CPUs
config: i386-randconfig-r2-0626 (attached as .config)

All error/warnings:

   kernel/printk/printk.c: In function 'log_buf_add_cpu':
>> kernel/printk/printk.c:269:37: error: 'CONFIG_LOG_CPU_MAX_BUF_SHIFT' undeclared (first use in this function)
    #define __LOG_CPU_MAX_BUF_LEN (1 << CONFIG_LOG_CPU_MAX_BUF_SHIFT)
                                        ^
>> kernel/printk/printk.c:864:42: note: in expansion of macro '__LOG_CPU_MAX_BUF_LEN'
     cpu_extra = (num_possible_cpus() - 1) * __LOG_CPU_MAX_BUF_LEN;
                                             ^
   kernel/printk/printk.c:269:37: note: each undeclared identifier is reported only once for each function it appears in
    #define __LOG_CPU_MAX_BUF_LEN (1 << CONFIG_LOG_CPU_MAX_BUF_SHIFT)
                                        ^
>> kernel/printk/printk.c:864:42: note: in expansion of macro '__LOG_CPU_MAX_BUF_LEN'
     cpu_extra = (num_possible_cpus() - 1) * __LOG_CPU_MAX_BUF_LEN;
                                             ^

vim +/CONFIG_LOG_CPU_MAX_BUF_SHIFT +269 kernel/printk/printk.c

   263	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
   264	#define LOG_ALIGN 4
   265	#else
   266	#define LOG_ALIGN __alignof__(struct printk_log)
   267	#endif
   268	#define __LOG_BUF_LEN (1 << CONFIG_LOG_BUF_SHIFT)
 > 269	#define __LOG_CPU_MAX_BUF_LEN (1 << CONFIG_LOG_CPU_MAX_BUF_SHIFT)
   270	static char __log_buf[__LOG_BUF_LEN] __aligned(LOG_ALIGN);
   271	static char *log_buf = __log_buf;
   272	static u32 log_buf_len = __LOG_BUF_LEN;

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